Extensive oxygen consumption in the intertidal infiltration zone of beach aquifers—the impact of seasonal input, filtration efficiency, and morphodynamics

Seawater infiltration into the permeable sands of beach aquifers creates a high input of biogeochemical reactants driven by tides and waves. The upper sand layer acts as a filter, retaining particulate organic matter (POM), which is degraded by bacteria under predominantly oxic conditions. The seaso...